Q.In many households, family members do not eat without bathing first and practise religious fasts. How have different social practices influenced your expression of hunger and thirst? Conduct a survey on five people from different backgrounds and prepare a report.

Social and religious practices (like eating only after bathing, or observing religious fasts) show that biological drives like hunger and thirst, though rooted in universal bodily mechanisms, are commonly shaped, delayed or deliberately suppressed by cultural and social conditioning. …

Hunger and thirst are two of the three classic biological (physiological) motives — along with sex — essential for the sustenance of the individual, regulated by internal bodily mechanisms working together with environmental cues. Hunger arises from internal signals (stomach contractions, low blood glucose, low fat/protein reserves, liver signals of fuel scarcity) and external cues (sight, smell and taste of food), coordinated by a hypothalamus-centred feeding-satiety system. Thirst is triggered by cellular water loss and reduced blood volume, detected by osmoreceptors in the anterior hypothalamus, which generate the drive to drink.

While the underlying biological triggers are universal, the actual expression and timing of eating and drinking behaviour is very often shaped, delayed, or restructured by social and cultural practice — exactly what this project asks students to investigate first-hand. Many households follow a rule that food is eaten only after bathing, delaying the satisfaction of a biologically driven hunger need until a culturally prescribed condition is met. Religious fasting practices, observed across many Indian traditions and faiths, go further still, involving a sustained, voluntary suppression of the hunger and/or thirst drive for religious, spiritual or social reasons, sometimes for many hours or a full day — showing that psychosocial and cultural motives can, at least temporarily, override or reshape the expression of an otherwise strong biological drive. This connects to the chapter's broader point that no motive is ever purely biological: biological drives are aroused, expressed, and sometimes deliberately delayed or suppressed, in combination with psychosocial and cultural factors. …